You need to feed everyday mate. the substrate will become charged way before the roots spread out. so 1L day 1 then just feed a little every day after that. you dont want loads run off. i have zero run off 99% of time. so just give 250-500ml daily for first week or so then bump to 1L and try get them on 2L daily soon as. But your roots will slow because of transplant and topping, so could take longer to build up dose.